Locking nut



Feb. 20, 1923. 1,445,955.

F. ILSEIVIANN.

LOCKING NUT. FILED JUNE 11, 1912'.

#indien/n l 175,3/ v

Patented Feb. ze, 1923.

1 UNITED STATE FRIEnRIcH insnmnivmfon Brennan-HORN, GERMANY;

LOCKING nur. A

Appiication inea ,June 11,

` conical recess in the locking member whereby the slit cone is compressed and the nut locked. Locking nuts are already known in which the nut is provided with a slit cone which on the nut being tightened, is forced into a corresponding recess lin a washer or in a second nut whereby the jaws ot the slit cone are firmly clamped on the thread of the screw bolt, ln all such nuts, however, the defect exists that after frequently` being tightened or even` after being tightened once only the slit cone is jumped up or deformed. j that the jaws or" the slitcone which must be regarded as beams firmly clamped on one side, areyielding on their free end only, so that it is only here that they are pressed against and locked on the thread while at their upper clamped end they yield but very little or not at all so that the external pressure produces a jumping up or deformation in the length of the jaws. By the irregular yielding and application of the jaws of the slit cone against the thread of the screw bolt the defects also arise that as the clamping jaws are clamped on the thread for a small portion of their length only and furthermore only a small surface is inl contact with the locking member the locking connection is adversely ali'ected while by the` modification in the form of the clamping` jaws the screw thread is distorted. y

The object of -the present invention is to avoid these defects and to provide a locking nut of great security, strength and durability. In the first place this result is attained owing to the fact that the nut portion is provided with wrench receiving sides of the same or minor diameter than the slit cone so that the elasticity of the jaws oi' the slit cone is more effective and uniform throughout their entire length and when the nut is tightened the jaws of' the cone are clamped uniformly on the thread of the This is due mainly to the fact vmerge directlyl into the nut.

19121 seriaiiiof. 703,038.

screw bolt throughout almost their entire length. This action vis still further increased owing to the fact that in accordance with the invention the slits in the slit cone project beyond said cone and are located inthe corners lof the nut proper masse" whereby the latter lis divided into a correj.

spending number of resilient portions.

As with the novel construction the resiliency ismainly furnished by the segments of the nut head it is not necessary to consider the resiliency in calculating the pitch of the, cone so'that the slit cone can be formed with a sharp pitch so that the cheeks are themselves very stiff andas soon as the cone' bears against the locking member on tightesi* ening the nut it develops a powerful radialy l pressure for locking purposes.

`Owing to the strong construction of the cheeks of the cone these cheeksjandthethread arenot deformed. 5

An embodiment ot' the invention is illus' trated in the accompanying' drawing, in which: l ,y

Figure l shows the nut in elevation. Figure l2 is a vertical section with the locking 'member part, and

Figure 3 is a plan. As shown very clearly in Figure 2 in par'- ticular the nut proper ci provided with the wrench receivingl sides, is of. the same or j minor diameter than the base circle of the slit cone Z). The slits @of this cone are 1ocated in the same planes as the edges of the nut proper and are .prolonged beyond the slit cone into the nut proper asovthat to a certain height it is divided into `a number ot `rlat resilient parts or segments.

it will of course be runderstood that the nut proper as shown in broken lines in Figure l might be continued in the slit cone, lin which case the latter would be somewhat weakened in its foot portion and would VVit-h this construction the simplest method of formation is to turn a cone on an ordinary piece of commercial hexagonal material and then effect the slitting after thethread has been formed. y

llVhat I claim and desire to secure by Letters-Patent of the United States is:

A lock-nut comprising in combination a polygonal portion provided with more than five wrench receiving sides, a conical .eX- tension or' said polygonal portion -having its base adjacent to said polygonal-portion andl situated in alnement with, and extending upnto the edges of said polygonal portion so that the lock-nut, down from va eertands` tance boloT the free edge of said polygonal portion, is divided into as Inanyelasi'o apS as there are dat parte of thepolygonal portion,v subst.antlz'llly` as desobed and Shown 10 and for the purpose Set forth.

In teet'hnony whereof I have signed my namefo 'bhls speci'ficatonn the presence of two Subscribing Witnesses. 'K

` ,FRIEDRICH ILSEMANN.

llvitnesses:

"IlEDn/RCK HAGERMANN, WILHELM STRPS. 

